A.相互關(guān)聯(lián)
B.互不相關(guān)
C.計量逐步精確
D.方法逐步改進
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A.側(cè)檢驗
B.左側(cè)檢驗
C.雙側(cè)檢驗
D.上側(cè)檢驗
A.精確假設(shè)
B.非精確假設(shè)
C.復(fù)合假設(shè)
D.備擇假設(shè)
A.28.35小時
B.28.59小時
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A.變量x的標準差
B.變最y的標準差
C.變量x和y兩標準差的乘積
D.變量x和y的協(xié)方差
A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
最新試題
一個地區(qū)一定時期的商品零售額屬于()
Which of the following statements is not true?()
A cumulative frequency distribution would provide().
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
以2000年a0為最初水平,2016年an為最末水平,計算鋼產(chǎn)量的年平均發(fā)展速度時,須開()
A cumulative frequency polygon is also called ().
品合格率指標是()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()
If the individual class frequency is divided by the total frequency, the result is the ().
Descriptive statistics deals with methods of()